Abstract

The use of the generalized Lorenz–Mie theory that describes the interaction between a spherical particle and an arbitrarily shaped beam requires knowledge of the beam-shape coefficients (BSC’s) that describe the illuminating beam. Classically, these BSC’s are evaluated from an a priori mathematical description of the illuminating beam. We propose a method that relies on intensity measurements along the beam axis that permits one to measure directly the BSC’s of an actual beam in the laboratory.

© 1998 Optical Society of America

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